Numerical simulations and a three-parameter nonlinear collective coordinate method show that positively perturbed sphalerons in false-vacuum φ⁴ theories evolve into relativistically expanding tabletop profiles with steepening, accelerating flanks.
Anco, Instability of sphalerons inϕ 4 models with a false vacuum
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Long-time behaviour of sphalerons in $\phi^4$ models with a false vacuum
Numerical simulations and a three-parameter nonlinear collective coordinate method show that positively perturbed sphalerons in false-vacuum φ⁴ theories evolve into relativistically expanding tabletop profiles with steepening, accelerating flanks.